fix(deps): update dependency @google-cloud/pubsub to ^0.22.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​google-cloud/pubsub	dependencies	minor	^0.21.1 -> ^0.22.0	source

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Release Notes

googleapis/nodejs-pubsub

v0.22.0

Compare Source

Implementation Changes

• fix(ts): do not ship types (#​377)

Road to TypeScript

• refactor(ts): improve types (2) (#​356)
• refactor(ts): updated lint and fix command to cover gts (#​375)
• refactor(ts): added ts style fix for src/iam.ts (#​352)
• refactor(ts): Added ts style fix for test/topic.ts (#​373)
• refactor(ts): Added ts style fix for test/subscription.ts (#​372)
• refactor(ts): Added ts style fix for test/subscriber.ts (#​371)
• refactor(ts): Added ts style fix for test/snapshot.ts (#​370)
• refactor(ts): Added ts style fix for test/publisher.ts (#​369)
• refactor(ts): added ts style fix for src/index.ts (#​351)
• refactor(ts): added ts style fix for src/publisher.ts (#​357)
• refactor(ts): added ts style fix for src/snapshot.ts (#​358)
• refactor(ts): added ts style fix for src/subscriber.ts (#​359)
• refactor(ts): added ts style fix for src/subscription.ts (#​360)
• refactor(ts): added ts style fix for src/topic.ts (#​361)
• refactor(ts): added ts style fix for src/util.ts (#​362)
• refactor(ts): added ts style fix for test/connection-pool.ts (#​364)
• refactor(ts): added ts style fix for test/histogram.ts (#​365)
• refactor(ts): added ts style fix for test/iam.ts (#​366)
• refactor(ts): added ts style fix for test/index.ts (#​368)
• refactor(ts): added ts style fix for src/connection-pool.ts (#​353)
• refactor(ts): added ts style fix for src/histogram.ts (#​354)
• refactor(ts): enable noImplicitAny on src/iam.ts (#​348)
• added ts style fix for system-test/pubsub.ts (#​374)
• chore: ts-ignoring some stuff in tests (#​343)

Dependencies

• fix: Pin @​types/sinon to last compatible version (#​345)
• chore(deps): update dependency @​types/sinon to v5.0.7 (#​349)

Documentation

• docs(samples): Publish with Retry Setting Example (#​355)
• docs: remove outdated comments (#​342)

Internal / Testing Changes

• chore: add a synth.metadata
• feat: Add optional delay when calling nack() (#​255) (#​256)

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